Rock-drill chuck



No Model.)

4E. G. DUNGEY. ROCKA DRILL CHUCK.V r

No. l245,063; Patented Aug. 2,1881.

l Y F i /e ry `I lll-llllll I lllllllllll i I .By lttCr/Ley A 4 l @W muy UNITED STATES PrVrENT OFFICE.

EDWIN G. DUNGEY, OFV REPUBLIC, ASSIGNOR TO DANIEL H. MERRI'IT, OF

u MARQUETTE, MICHIGAN.

ROCK-DRILL CHUCK.

SPECIFICATION Yforming part of Letters Patent No. 245,063, dated August 2, 1881. Application filed JunelO, 1881. (No model.)

To all whom it may concern:

.Be it known that I, EDWIN G.DUNGEY,`a citizen of the United States, residing at Republic, in the county of Marquette and State ofV Michigan, haveinvented certain new and useful Improvements in Rock-Drill Chucks 5 and I do hereby declare the following to be a full, clear, and exact description ot' the invention, such as will enable others skilled in the art to 1o which it appertains to make and use the same,

reference being had to the accompanying drawings, and to the letters or gures of reference marked thereon, which form apart ot' this specification.

My invention relates to certain new and useful improvements in chucks, more especially designed for use in the class of rockdrilling machines for connecting the piston-rod and drill; and the object oi' the invention is to 2o overcome difficulties heretofore existing in that class of machines having the drill inserted in the end of rod and held by a clamp, which is continuously Working loose and causing trouble; and also to obviate another very serious difficulty which is found in' all "other classes of chucks-viz., a tendency to Wear out of center, and thereby allow the drill to get out of true, and in rotating describe a circle around the true center, (commonly termed 3c wabbling,) which causes the drill to stick and bind in the hole, (especially if a deep one,) and sometimes requiring an abandonment of the hole being drilled on that account; and to this end the invention consists in novel fea- 3 5 tures of construction and combination of parts, all as will be hereinafter fully described, and specifically pointed out in the claims.

Referring to the accompanying drawings, Figure 1 represents alongitudinal vertical section, showing the drill and piston-rod con` nected by my improved chuck; Fig. 2, a crosssection through the line m w of Fig. l; Fig. 3, a cross-section through the line y y ot' Fig. 1; Fig. 4, detached views of the two parts composing the chuck and piston-rod.

A represents the piston-rod having its end which is connected to the chuck enlarged and provided with a series of annular rings, a, and intermediate annular" grooves, c.

B C represent the two parts composing the 5o chuck, which are adapted to apply and iit closely around said piston-rod and the drill D.

The partsB C of the chuck are provided with interior semicircular rings, b, and grooves c, which, when applied to the piston-rod, form annular rings and grooves, which alternate with the ringsand grooves of the piston-rod,

so that the rings of each fit in the grooves ot' the other, all as clearly shown in Fig. 1.

The piston-rod is provided with a lug, E, 6o which tits in a recess, e, in the part G ot' the chuck,- and thereby prevents the chuck from turning on said rod.

The exterior surface of the chuck is made tapering at the end in which the rod is received, and awide taperin g band, F, adapted to t over said tapering end in the position shown in Fig. 1, holds the parts of the chuck and piston-rod rmly in position as long as the band is tight thereon. v The opposite end of the 7o chuck, in which the drill is secured, is made rectangular in cross-section, and provided with liolesGr Gr through the two parts thereof, and recesses gg for the reception of the headed ends h l1J of the bolts H H, which pass through the 75 holes and thereby prevent the bolts from turnlng.

The bolts havescrew-threaded ends i c' for the screw-nuts I I, by which the drill is securely clamped or held between the two parts 8o composing the chuck, all as clearly shown in Fig. 3.

The above-described construction of chuck obviates the objections before referred to, and preserves a uniform center for the drill, while 8 5 `firmly holding it in position.

Having thus fully described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

l. The combination of the piston-rod A, hav- 9o ing the annular rings c and intermediate grooves, c', the partsB G, composing the chuck, having interior semicircular rings, b', and grooves c, and means for securing said rod and parts of the chuck together, substantially as specified.

2. The combination ofthe piston-rod A, having the annular rings and grooves and the lug E, and the chuck composed of the parts B C, havinginterior rings and grooves, and the recess c, for the reception of said lug, substantially as specified.

3. The combination, with the drill, of the piston-rod A, provided with the rings and grooves a a and lug E, the chuck composed of the parts B C, having rings and grooves b c, recess e, and exterior conical surface,the clampl 

